Alert archive / Illinois / Flood Watches / 2026
Flood Watches in Illinois, August 2026
16 flood watches in August 2026. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flood watches reaches back to 2005.
Flood Watches by county
Each county as a circle sized by its count in August 2026. Tap one for its archive.
- Flood Watches
- 16
- Busiest day
- August 13, 20263 flood watches
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 10:11 AM CDT | Flood Watch | ILX | Champaign, Douglas, Edgar, Vermilion | 11 hr |
| Aug 1, 10:22 AM CDT | Flood Watch | LOT | Cook, DuPage, Ford, Grundy, Iroquois, Kankakee and 3 more | 11 hr |
| Aug 5, 1:57 AM CDT | Flood Watch | LSX | Adams, Brown, Calhoun, Greene, Jersey, Madison and 3 more | 35 hr |
| Aug 5, 2:03 AM CDT | Flood Watch | DVN | Hancock, Henderson, McDonough, Mercer, Warren | 16 hr |
| Aug 9, 5:03 PM CDT | Flood Watch | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 10 hr |
| Aug 13, 2:02 AM CDT | Flood Watch | ILX | Champaign, Clark, Coles, Cumberland, DeWitt, Douglas and 13 more | 36 hr |
| Aug 13, 2:08 AM CDT | Flood Watch | LOT | DeKalb, Ford, Grundy, Iroquois, Kankakee, Kendall and 5 more | 32 hr |
| Aug 13, 2:22 AM CDT | Flood Watch | DVN | Bureau, Carroll, Hancock, Henderson, Henry, McDonough and 5 more | 56 hr |
| Aug 14, 12:01 PM CDT | Flood Watch | LOT | Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 8 more | 22 hr |
| Aug 14, 12:15 PM CDT | Flood Watch | ILX | Champaign, DeWitt, Douglas, Edgar, Fulton, Knox and 10 more | 22 hr |
| Aug 14, 9:48 PM CDT | Flood Watch | LSX | Adams, Brown | 12 hr |
| Aug 15, 6:39 PM CDT | Flood Watch | LOT | Cook, Ford, Grundy, Iroquois, Kankakee, Kendall and 3 more | 13 hr |
| Aug 15, 7:12 PM CDT | Flood Watch | ILX | Champaign, DeWitt, Fulton, Knox, McLean, Marshall and 6 more | 13 hr |
| Aug 19, 2:35 AM CDT | Flood Watch | ILX | Champaign, DeWitt, Fulton, Knox, Logan, McLean and 10 more | 22 hr |
| Aug 19, 2:56 AM CDT | Flood Watch | LOT | Ford, Iroquois, Livingston | 22 hr |
| Aug 19, 8:23 PM CDT | Flood Watch | PAH | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 11 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Ford County6
- Iroquois County6
- Livingston County6
- Champaign County5
- Vermilion County5
- Grundy County5
- Kankakee County5
- Kendall County5
- Will County5
- Cook County4
- LaSalle County4
- DeWitt County4
- Knox County4
- McLean County4
- Marshall County4
- Peoria County4
- Piatt County4
- Stark County4
- Tazewell County4
- Woodford County4
- Douglas County3
- Edgar County3
- DuPage County3
- DeKalb County3
- Lee County3
- Ogle County3
- Fulton County3
- Adams County2
- Brown County2
- Hancock County2
- Henderson County2
- McDonough County2
- Mercer County2
- Warren County2
- Kane County2
- Logan County2
- Macon County2
- Mason County2
- Calhoun County1
- Greene County1
32 more counties
- Jersey County1
- Madison County1
- Monroe County1
- Pike County1
- Saint Clair County1
- Boone County1
- Lake County1
- McHenry County1
- Winnebago County1
- Clark County1
- Coles County1
- Cumberland County1
- Moultrie County1
- Bureau County1
- Carroll County1
- Henry County1
- Putnam County1
- Rock Island County1
- Whiteside County1
- Schuyler County1
- Menard County1
- Alexander County1
- Gallatin County1
- Hardin County1
- Jackson County1
- Johnson County1
- Massac County1
- Pope County1
- Pulaski County1
- Saline County1
- Union County1
- Williamson County1
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.